Contra Costa Mosquito & Vector Control

FOR IMMEDIATE RELEASE     -     July 12, 2012

Contact: Deborah Bass
              Public Affairs Mgr.

(925) 771-6112 - office
(925) 260-4670 - mobile 


Public is urged to wear mosquito repellent now and at The Brentwood Cornfest 


CONCORD, CALIFORNIA - - The Contra Costa Mosquito & Vector Control District announced today that two birds and two groups of mosquitoes tested positive for West Nile virus. The birds, both American crows, were found near Pecan Place and Hickory Drive in Brentwood and Margie Drive and Susan Lane in Pleasant Hill. The infected mosquitoes were trapped in Brentwood, one group at Garin Parkway and Spruce Street and the other group at Chestnut Street and Sellers Avenue. 


"Our employees are scouring the area to find mosquito sources, and we have found many backyard sources that had mosquitoes such as fish ponds and neglected pools," said Carlos Sanabria, operations manager for the District. "But, we are still trapping high numbers of mosquitoes and need the public's help finding their sources nestled in their neighborhoods."


Sanabria urges residents to check their properties for mosquito sources and to report any neglected standing water, including neglected swimming pools, in their neighborhoods to the District. Reports may be made anonymously.


Residents are urged to wear mosquito repellent when outdoors, especially at dawn and dusk when mosquitoes are present. This weekend, The Brentwood Cornfest will draw nearly 50,000 attendees to the area. Festival attendees are also urged to wear repellent. 


West Nile virus symptoms of the mild form include fever, headache, tiredness, body aches, and swollen lymph glands. While the illness can be as short as a few days, even healthy people have reported being sick for several weeks. 

Less than one percent of individuals (about 1 in 150 people) infected with West Nile virus will develop severe illness. The severe symptoms can include high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis. These symptoms may last several weeks, and neurological effects may be permanent. West Nile virus infection can be fatal.    


Residents are urged to help reduce their risk of contracting mosquito-borne diseases by following these guidelines: 

  • Don't produce mosquitoes on your property. Dump or drain standing water. Mosquitoes can't begin their life without water.
  • Defend yourself against mosquitoes using repellents containing DEET, Picaridin, or Oil of Lemon Eucalyptus.
  • Avoid being outdoors when mosquitoes are present, typically Dawn and Dusk.
  • Report neglected swimming pools by calling 925-771-6195 or visiting  Anonymous calls accepted. Just one neglected pool can produce more than 1 million mosquitoes and affect people up to five miles away.  
The District makes every effort to notify residents about West Nile virus activity and adult mosquito spraying events. People wishing to be notified about adult mosquito spraying in residential areas have several options. They may visit the District's website and opt to receive the maps and notifications automatically by email.There is also an option to receive media releases and the Mosquito Bytes newsletter. These communications are posted directly on the District's website. Spray schedules are also available by calling the District at (925) 771-6195 and listening to a recorded message. 

Since 2005, 39 people in Contra Costa County have been diagnosed with West Nile virus. In 2006, two people died from the disease. A recent study has shown that the majority of cases are undiagnosed and grossly under reported.

Contra Costa Mosquito & Vector Control District, an independent special district and public health agency, is located at 155 Mason Circle in Concord. Call the District to report mosquito problems at (925) 771-6195 or visit their office between 8:00 a.m. and 4:30 p.m. to get FREE mosquitofish for ornamental ponds, horse troughs or neglected swimming pools.  

For information concerning human West Nile virus symptoms, prevention, or testing, please call the Contra Costa Health Services department at (888) 959-9911. For information concerning West Nile virus and horses, please call the California Department of Food and Agriculture Animal Health Branch at (916) 654-1447. 

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